1、rename函数的作用：将一个文件名重命令成另一个文件名；
举例：
rename("/home/test/cfg.ini.tmp","/home/test/cfg.ini");
rename()
Rename a file
Synopsis:
#include <stdio.h>
int rename( const char* old,
const char* new );Arguments:
old
The path to the file that you want to rename. If the path doesn't include a directory, rename() looks for the file in the current working directory.
new
The new name for the file. If the path doesn't include a directory, rename() creates the file in the current working directory.
2、remove函数删除文件
举例：remove("/home/test/111.raw");
remove()
Remove a link to a file
Synopsis:
#include <stdio.h> int remove( const char * filename );
Arguments:
filename
The path to the file that you want to delete.
3、总结：
c语言中可以使用函数对文件进行操作，实现shell命令功能，当然也可以使用system来通过shell命令实现功能。